I have been troubleshooting the SMPS in a dead HP L2445w 23" TFT monitor for the past week. Finally found the culprit, a 0.1nF ceramic disc bypass capacitor on VDD of the SG6902 PFC/Flyback PWM Combination Controller. When the capacitor was removed, the switching returned, so I replaced with a similar one from a SMPS in my scrap bin.
When I got the power back I could see a whole bunch of dead pixel islands in the bottom of the screen. The person I got it from said it was barely used and worked perfectly until it went black, so my guess is that it is due to transport damage. Is there anything that can be done about this kind of damage, or is all hope lost?